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MAX11209 View Datasheet(PDF) - Maxim Integrated

Part NameMAX11209 MaximIC
Maxim Integrated MaximIC
Description18-Bit, Single-Channel, Ultra-Low-Power, DeltaSigma ADCs with Programmable Gain and GPIO
MAX11209 Datasheet PDF : 27 Pages
First Prev 21 22 23 24 25 26 27
MAX11209/MAX11211
18-Bit, Single-Channel, Ultra-Low-Power, Delta-
Sigma ADCs with Programmable Gain and GPIO
DATA: Data Register
The data register is a 24-bit read-only register. Any attempt to write data to the data register has no effect. The data
read from this register is clocked out MSB first. The data register holds the conversion result. D17 is the MSB, and D0
is the LSB. The result is stored in a format according to the FORMAT bit in the CTRL1 register.
The data format while in unipolar mode is always straight binary. In straight binary format, the most negative value is
0x00000 (VAINP - VAINN = 0V), the midscale value is 0x20000 (VAINP - VAINN = VREF/2), and the most positive value
is 0x3FFFF (VAINP - VAINN = VREF).
In bipolar mode, if the FORMAT bit = 1, then the data format is offset binary. If the FORMAT bit = 0, then the data
format is two’s complement. In two’s complement the negative full-scale value is 0x20000 (VAINP - VAINN = -VREF), the
midscale is 0x00000 (VAINP - VAINN = 0V), and the positive full scale is 0x1FFFF (VAINP - VAINN = VREF). Any input
exceeding the available input range is limited to the minimum or maximum data value.
Table 15. DATA Register (Read Only)
BIT
D17
D16
D15
D14
D13
D12
D11
D10
DEFAULT
0
0
0
0
0
0
0
0
BIT
D9
D8
D7
D6
D5
D4
D3
D2
DEFAULT
0
0
0
0
0
0
0
0
BIT
D1
D0
0
0
0
0
0
0
DEFAULT
0
0
0
0
0
0
0
0
Table 16a. Output Data Format for the Unipolar Input Range
INPUT VOLTAGE
VAINP - VAINN
≥ VREF
VREF
×
1
1
218
1
VREF
218 1
0
DIGITAL OUTPUT CODE FOR UNIPOLAR RANGE
STRAIGHT BINARY FORMAT
0x3FFFF
0x3FFFF
0x00001
0x00000
Maxim Integrated
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